254 Series Explosion-Proof Convector
Heatrex’s 254 Series explosion-proof convector is designed to provide a heavy duty and corrosion resistant heat source.
Standard Features
Wide Selection of Sizes
Four compact sizes to fit any space with ratings from 500 to 9500 watts.
Sloped Top Cabinet
Prevents objects from being set on top of the convector, which can restrict airflow and cause overheating.
Single and Three-Phase
Unique design provides single and balanced three-phase loads in a single element.
Gas and Dust Atmospheres
Three listings cover the entire field, two for hazardous gases and vapors and one for dust particles.
Wet Locations
All unit sizes available with iridite-coated elements and powder-coated frames for NEMA 3 wet locations.
Construction Features
Element
Grade A Nickel-Chrome heating coils are insulated with ceramics and magnesium oxide from the copper heater tube and fitted with large aluminum fins locked in place.
Cabinet
Heavy gauge steel cabinet is painted with a beige powder coat for durability. Cabinet should be mounted at least 6 inches (152 mm) above the floor. Factory-furnished wall brackets make installation easy.
Thermal Protection
A linear limit, automatic reset thermal cutout is built into every unit.
Complete Electrical Package
For larger single-phase and all three-phase units, a built-on contactor/transformer option package is available.
Applications
Battery Storage Areas
Chemical Plants
Coal Handling Facilities
Dry Cleaning Plants
Gasoline Fueling/Storage Areas
Grain Elevators
Oil Refineries
Paint Spraying/Storage Areas
Petrochemical Plants
Standards
Class I, Divisions 1 and 2, Groups B, C and D
Class I, Zones 1 and 2, Group IIC
Comparison Chart
| Features | ULTRA-SAFE™ EXP | COMPACT | Convector |
| Hazardous Location NEC Classifications |
Class I, Divisions 1 and 2, Groups C and D Class II, Divisions 1 and 2, Groups E, F and G Class I, Zones 1 and 2, Groups IIB |
Class I, Divisions 1 and 2, Group D Class I, Zones 1 and 2, Group IIA |
Class I, Divisions 1 and 2, Groups B, C and D Class II, Divisions 1 and 2, Groups E, F and G Class I, Zones 1 and 2, Group IIC |
| Ignition Temperature Code | T3C 320°F (160°C) |
T3 392°F (200°C) (Varies with KW) |
T3C 320°F (160°C) (Varies with classification) |
| KW Range | Up to 30 KW | Up to 12 KW | Up to 9.5 KW |
| Standard Built-in Overtemperature Protection | Dual overtemperature protection with automatic manual reset thermal cutouts | Primary and secondary automatic reset cutouts with backup contactor, fan delay relay | Primary automatic reset cutout |
| Other Standard Built-in Controls | Controlling contactor, control circuit transformer | Controlling and backup contactor | None |
| Standard Control Voltage | 24V | 120V | Maximum 277V |
| Single Point Line Voltage Connection for Incoming Power |
Yes | Separate 120V motor line required | Yes |
| Optional Built-in Controls | |||
| Thermostat | Yes | No | Yes |
| Disconnect Switch | Yes | No | Yes |
| Selector Switch | Yes | No | No |
| Manual Reset Cutout | Yes | No | |
| “Heater On” Pilot Light | Yes | No | No |
| “Warning” Pilot Light | Yes | No | No |
| Control Circuit Transformer | Yes | No | Yes |
| Step Controller | No | No | No |
| Power Fusing | No | No | No |
| Standard Construction | |||
| Heater Assembly | Liquid-to-air heat exchanger, steel tube with steel fins, propylene glycol, immersion heater | Heavy gauge stainless steel finned tubular elements | Heater core enclosed in copper tube with large aluminum fins |
| Cabinet/Housing | Powder coated galvanized steel | Stainless steel | Powder coated steel |
| NEMA 7, 9 Control Enclosure | Cast aluminum | Cast aluminum | Epoxy coated steel |
| Mounting Brackets | Wall, ceiling or pole mounting kits (optional) | Swivel mounting bracket (standard) | Wall mounting bracket (standard) |
| Optional Constructions | |||
| Dirty Duty Corrosion Resistant | Choice of 316SS Construction or Heresite® coating | Yes | Wet locations (NEMA 3) iridite coated elements |
| 50 Hz Motor | Yes | No | No |
| Agency Approvals | |||
| CSA (Canadian Standards Association) | Yes | Yes | Yes |
| ABS (American Bureau of Shipping) | No | Yes | Yes |
| Stock Designs Available | Yes | Yes | |
